Goodea is the type genus of the Goodeidae, a family of live-bearing fish endemic to the cool interior highlands of Mexico, including the Lerma-Santiago drainage. Goodeids give birth to free-swimming young like the more familiar poeciliid livebearers, but the resemblance is only skin deep: developing embryos are nourished through trophotaeniae, ribbon-like placenta-analogous structures trailing from the vent, rather than relying mainly on a yolk sac. Goodea atripinnis and Goodea gracilis are large for the family at 4.5–5 in, deep-bodied, silvery fish built for the cooler, often turbid highland waters they inhabit.
Both species are kept mainly by dedicated goodeid specialists rather than the mainstream livebearer trade, valued more for their hardiness, cool-water tolerance, and interesting reproductive biology than for bright coloration. Mexico's highland lakes and rivers face heavy pressure from water extraction, pollution, and introduced species, and many goodeids in the family are in decline as a result; of the two species here, Goodea atripinnis is currently assessed Least Concern while Goodea gracilis has not yet been evaluated.